Lenovo ThinkServer RD650 User Manual page 276

12Gb/s MegaRAID SAS Software User Guide
March 2014
to cool and house the drives, respectively. Also, this technology helps avoid application timeouts caused by spin-up
delays and drive wear caused by excessive spin-up/down cycles.
You can use the Power Settings field in the MegaRAID Storage Manager software to choose whether to allow
unconfigured drives or Commissioned Hotspares to enter Power-Save mode.
When they are in the Power-Save mode, unconfigured drives and drives configured as Commissioned Hotspares
(dedicated or global) can be spun down. When spun down, the drives stay in Power-Save mode except for periodic
maintenance, which includes the following:
Periodic background media scans (Patrol Read) to find and correct media defects to avoid losing data redundancy

(hot spare drives only)
Use of a Commissioned Hotspare to rebuild a degraded drive group (Commissioned Hotspare drives only)

Update of disk data format (DDF) and other metadata when you make changes to RAID configurations

(Commissioned Hotspare drives and unconfigured drives)
Follow these steps to change the power-save setting.
1. Select a controller icon in the Physical tab or the Logical tab in the left panel of the MegaRAID Storage
Manager window.
2. Select Go To > Controller > Manage Power Settings from the menu bar.
The Manage Power Save Settings dialog appears.
Figure 166 Manage Power Save Settings
3. Select the Unconfigured Drives check box to let the controller enable the unconfigured drives to enter the
Power-Save mode.
4. Select the Hot spare Drives check box to let the controller enable the Hot spare drives to enter the Power-Save
mode.
5. Select the drive standby time (Alt+D) using the drop-down list from the Drive standby time field.
NOTE The Dimmer Switch technology is enabled by default.
NOTE If your controller does not support this option, the Power Settings
field does not appear.
LSI Corporation
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Chapter 9: Configuration
Changing Power Settings